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All posts related to Engineering entrance

Navdeep Kaur
Shared from Alkyl Halides on Jul 22, 2020 3:03 PM

Arrange the following in decreasing order of the rate of hydrolysis:

1. PhCH2Cl
2. PhCH(Cl)CH3
3. Ph2CHCl
4. Ph3CCl

 
1 > 2 > 3 > 4
1 > 3 > 2 > 4
2 > 1 > 4 > 3
3 > 2 > 1 > 4
4 > 3 > 2 > 1
Please type your answer before submitting.
Navdeep Kaur

Please give the full explanation.

Ganesh Sai
Shared from JEE Main Mock - 1 on Jul 11, 2020 11:57 AM

In a plane, there are 37 straight lines, out of which 13 pass through the point A and 11 pass through the point B. Besides, no three lines pass through the same point, no line passes through both points A and B, and no two lines are parallel. The number of intersection points the lines have is equal to

 
535
601
728
963
Please type your answer before submitting.
Ganesh Sai

Here my doubt is it is given that 13 pass through point A and 11 pass through point B. at the same time it is give that no three lines pass through the same point. how is this possible?

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Santosh Vishwanathan
Shared from BITSAT Mock - 9 on Jul 05, 2020 10:42 PM

Both Co3+ and Pt4+ have coordination number as six. Which of the following pairs of complexes will show approximately the same electrical conductance for their 0.001 M aqueous solutions?

 
CoCl3.4NH3 and PtCl4.4NH3
CoCl3.3NH3 and PtCl4.5NH3
CoCl3.6NH3 and PtCl4.5NH3
CoCl3.6NH3 and PtCl4.3NH3
Please type your answer before submitting.
Santosh Vishwanathan

Coordination number of Pt is 6 so 6 nh3 molecules should be a part of the complex. So the answer has to be a) not c) Anyone agree with me?

Vibrant
Shared from BITSAT Mock - 13 on Jul 01, 2020 4:48 PM
Show common data

He found the bay 'fresh and unlittered' because

 
the sea water had receded
he was the first visitor there
the high tide had just washed the litter away
it was not frequented by people
Please type your answer before submitting.
Vibrant

The same sentence also states that it was not frequented by people

Ganesh Sai
Shared from BITSAT Mock - 2 on Jun 24, 2020 3:09 PM

A uniform but time varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper as shown in the figure. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

 
is zero
decreases as
increases as r
decreases as
Please type your answer before submitting.
Sukumar Das

A time varying magnetic field produces an induced electric field.
rnE.* (2 pi r ) = (pi*a*a) dB/dt
rnE =( a*a /2r)(dB/dt)
rnso, E decreases as 1/r

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